1 files changed, 113 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/cache/h2/H2CacheDefProxy.java b/java/com/google/gerrit/server/cache/h2/H2CacheDefProxy.java
new file mode 100644
index 0000000000..48c0a5bd81
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+++ b/java/com/google/gerrit/server/cache/h2/H2CacheDefProxy.java
@@ -0,0 +1,113 @@
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.cache.h2;
+
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.Weigher;
+import com.google.gerrit.common.Nullable;
+import com.google.gerrit.server.cache.PersistentCacheDef;
+import com.google.gerrit.server.cache.h2.H2CacheImpl.ValueHolder;
+import com.google.gerrit.server.cache.serialize.CacheSerializer;
+import com.google.inject.TypeLiteral;
+import java.time.Duration;
+
+class H2CacheDefProxy<K, V> implements PersistentCacheDef<K, V> {
+  private final PersistentCacheDef<K, V> source;
+
+  H2CacheDefProxy(PersistentCacheDef<K, V> source) {
+    this.source = source;
+  }
+
+  @Override
+  @Nullable
+  public Duration expireAfterWrite() {
+    return source.expireAfterWrite();
+  }
+
+  @Override
+  @Nullable
+  public Duration expireFromMemoryAfterAccess() {
+    return source.expireFromMemoryAfterAccess();
+  }
+
+  @SuppressWarnings("unchecked")
+  @Override
+  public Weigher<K, V> weigher() {
+    Weigher<K, V> weigher = source.weigher();
+    if (weigher == null) {
+      return null;
+    }
+
+    // introduce weigher that performs calculations
+    // on value that is being stored not on ValueHolder
+    return (Weigher<K, V>)
+        new Weigher<K, ValueHolder<V>>() {
+          @Override
+          public int weigh(K key, ValueHolder<V> value) {
+            return weigher.weigh(key, value.value);
+          }
+        };
+  }
+
+  @Override
+  public String name() {
+    return source.name();
+  }
+
+  @Override
+  public String configKey() {
+    return source.configKey();
+  }
+
+  @Override
+  public TypeLiteral<K> keyType() {
+    return source.keyType();
+  }
+
+  @Override
+  public TypeLiteral<V> valueType() {
+    return source.valueType();
+  }
+
+  @Override
+  public long maximumWeight() {
+    return source.maximumWeight();
+  }
+
+  @Override
+  public long diskLimit() {
+    return source.diskLimit();
+  }
+
+  @Override
+  public CacheLoader<K, V> loader() {
+    return source.loader();
+  }
+
+  @Override
+  public int version() {
+    return source.version();
+  }
+
+  @Override
+  public CacheSerializer<K> keySerializer() {
+    return source.keySerializer();
+  }
+
+  @Override
+  public CacheSerializer<V> valueSerializer() {
+    return source.valueSerializer();
+  }
+}